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Taxes - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Income tax | kr (2,215) | kr (2,785) | kr (5,497)
Effective tax rate | 85.60% | (11.90%) | 22.30%
Deferred tax assets | kr 24,412 | kr 22,375 |
Tax loss carry-forwards | 25,354 | 27,666 |
Unrecognized tax loss carry forwards | 11,025 | 8,918 |
Unrecognized tax loss carry forwards, tax value | 2,399 | 1,819 |
Unrecognized deferred tax credits tax value | 1,114 | 1,148 |
Recognized deferred tax credits tax value | 5,027 | 5,453 |
Non-tax deductible goodwill impairment test | 15,100 | 31,900 |
DeferredTax | 4,563 | 1,406 |
Current tax | (6,461) | (4,289) | kr (7,353)
Department of justice [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Income tax |  |  | 450
Other comprehensive income [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
DeferredTax | 507 | (631) |
Current tax | 117 | 137 |
Loss Carry Forwards [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Deferred tax assets | kr 5,603 | 6,158 |
Sweden [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Expected applicable tax rate | 20.60% |  |
Impaired withholding tax assets |  |  | kr 411
Sweden [member] | Loss Carry Forwards [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Deferred tax assets | kr 3,815 | kr 4,172 |

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